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the effect of HSD in modulating the immuno-inflammatory response to severe head injury and its effect on modulation the release of neuro-biomarkers into serum; evaluating the role of serum neuro-biomarkers in predicting patient outcome [ Time Frame: samples taken within 48 hours of incident ]

This clinical trial will evaluate the ease of conducting a randomized trial on patients with severe head injury who are cared for by paramedics in the out of hospital setting. The trial will compare two different kinds of fluids that are commonly used to elevate blood pressure and minimize the impact of the brain injury. The two solutions are a salt solution of different concentrations. One is a normal saline solution similar to the consistency of human blood and the other is a higher concentration mixed with a sugar that helps to keep the solution in the blood stream longer. This study is conducted without patient consent at the time of the study enrolment. The study will report on whether this trial is feasible in the out of hospital setting before launching into a larger definitive trial.

Detailed Description

The Toronto Prehospital Hypertonic Resuscitation-Head Injury and Multi Organ Dysfunction Trial (TOPHR HIT) is a randomized, placebo-controlled out of hospital trial of blunt trauma patients with head injuries. The study compares a group receiving normal saline according to a paramedic's protocol, with a treatment group receiving a single dose 250 ml of 7.5% hypertonic saline in 6% dextran 70 (RescueFlow BioPhausia AB, Stockholm Sweden).

The primary objective of this study is to report feasibility in accordance with the methodology described by Lancaster and Dodds*, specifically addressing:

baseline survival rates for the treatment and control group to aid in the design of a definitive multicentre trial.

randomization compliance rate.

ease of protocol implementation in the out-of-hospital setting.

adverse rate of HSD infusion.

The secondary objectives include measuring the effect of HSD in modulating the immuno-inflammatory response to severe head injury and its effect on modulating the release of neuro-biomarkers into serum; evaluating the role of serum neuro-biomarkers in predicting patient outcome and clinical response to HSD intervention; evaluating effects of HSD on brain atrophy post-injury and neurocognitive and neuropsychological outcomes.